Buggy code:
public class ProjectHelperImpl extends ProjectHelper { private static final FileUtils FILE_UTILS = FileUtils . getFileUtils ( ) ; private Parser parser ; private Project project ; private File buildFile ; private File buildFileParent ; private Locator locator ; private Target implicitTarget = new Target ( ) ; public ProjectHelperImpl ( ) { } public void parse ( Project project , Object source ) throws BuildException { } static class AbstractHandler extends HandlerBase { protected DocumentHandler parentHandler ; ProjectHelperImpl helperImpl ; public AbstractHandler ( ProjectHelperImpl helperImpl , DocumentHandler parentHandler ) { } public void startElement ( String tag , AttributeList attrs ) throws SAXParseException { } public void characters ( char [ ] buf , int start , int count ) throws SAXParseException { } public void endElement ( String name ) throws SAXException { } } static class RootHandler extends HandlerBase { ProjectHelperImpl helperImpl ; public RootHandler ( ProjectHelperImpl helperImpl ) { } public InputSource resolveEntity ( String publicId , String systemId ) { } public void startElement ( String tag , AttributeList attrs ) throws SAXParseException { } public void setDocumentLocator ( Locator locator ) { } } static class ProjectHandler extends ProjectHelperImpl . AbstractHandler { public ProjectHandler ( ProjectHelperImpl helperImpl , DocumentHandler parentHandler ) { } public void init ( String tag , AttributeList attrs ) throws SAXParseException { String def = null ; String name = null ; String id = null ; String baseDir = null ; for ( int i = 0 ; i < ( attrs . getLength ( ) ) ; i ++ ) { String key = attrs . getName ( i ) ; String value = attrs . getValue ( i ) ; if ( key . equals ( "default" ) ) { def = value ; } else if ( key . equals ( "name" ) ) { name = value ; } else if ( key . equals ( "id" ) ) { id = value ; } else if ( key . equals ( "basedir" ) ) { baseDir = value ; } else { throw new SAXParseException ( ( ( "Unexpected<seq2seq4repair_space>attribute<seq2seq4repair_space>\"" + ( attrs . getName ( i ) ) ) + "\"" ) , helperImpl . locator ) ; } } if ( ( def != null ) && ( ! ( def . equals ( "" ) ) ) ) { <START_BUG> helperImpl . project . setDefaultTarget ( def ) ; <END_BUG> } else { throw new BuildException ( "The<seq2seq4repair_space>default<seq2seq4repair_space>attribute<seq2seq4repair_space>is<seq2seq4repair_space>required" ) ; } if ( name != null ) { helperImpl . project . setName ( name ) ; helperImpl . project . addReference ( name , helperImpl . project ) ; } if ( id != null ) { helperImpl . project . addReference ( id , helperImpl . project ) ; } if ( ( helperImpl . project . getProperty ( "basedir" ) ) != null ) { helperImpl . project . setBasedir ( helperImpl . project . getProperty ( "basedir" ) ) ; } else { if ( baseDir == null ) { helperImpl . project . setBasedir ( helperImpl . buildFileParent . getAbsolutePath ( ) ) ; } else { if ( new File ( baseDir ) . isAbsolute ( ) ) { helperImpl . project . setBasedir ( baseDir ) ; } else { File resolvedBaseDir = ProjectHelperImpl . FILE_UTILS . resolveFile ( helperImpl . buildFileParent , baseDir ) ; helperImpl . project . setBaseDir ( resolvedBaseDir ) ; } } } helperImpl . project . addTarget ( "" , helperImpl . implicitTarget ) ; } public void startElement ( String name , AttributeList attrs ) throws SAXParseException { } private void handleTarget ( String tag , AttributeList attrs ) throws SAXParseException { } } static class TargetHandler extends ProjectHelperImpl . AbstractHandler { private Target target ; public TargetHandler ( ProjectHelperImpl helperImpl , DocumentHandler parentHandler ) { } public void init ( String tag , AttributeList attrs ) throws SAXParseException { String name = null ; String depends = "" ; String ifCond = null ; String unlessCond = null ; String id = null ; String description = null ; for ( int i = 0 ; i < ( attrs . getLength ( ) ) ; i ++ ) { String key = attrs . getName ( i ) ; String value = attrs . getValue ( i ) ; if ( key . equals ( "name" ) ) { name = value ; if ( name . equals ( "" ) ) { throw new BuildException ( ( "name<seq2seq4repair_space>attribute<seq2seq4repair_space>must<seq2seq4repair_space>not" + "<seq2seq4repair_space>be<seq2seq4repair_space>empty" ) , new Location ( helperImpl . locator ) ) ; } } else if ( key . equals ( "depends" ) ) { depends = value ; } else if ( key . equals ( "if" ) ) { ifCond = value ; } else if ( key . equals ( "unless" ) ) { unlessCond = value ; } else if ( key . equals ( "id" ) ) { id = value ; } else if ( key . equals ( "description" ) ) { description = value ; } else { throw new SAXParseException ( ( ( "Unexpected<seq2seq4repair_space>attribute<seq2seq4repair_space>\"" + key ) + "\"" ) , helperImpl . locator ) ; } } if ( name == null ) { throw new SAXParseException ( "target<seq2seq4repair_space>element<seq2seq4repair_space>appears<seq2seq4repair_space>without<seq2seq4repair_space>a<seq2seq4repair_space>name<seq2seq4repair_space>attribute" , helperImpl . locator ) ; } target = new Target ( ) ; target . addDependency ( "" ) ; target . setName ( name ) ; target . setIf ( ifCond ) ; target . setUnless ( unlessCond ) ; target . setDescription ( description ) ; helperImpl . project . addTarget ( name , target ) ; if ( ( id != null ) && ( ! ( id . equals ( "" ) ) ) ) { helperImpl . project . addReference ( id , target ) ; }

Fix:
helperImpl . project . setDefault ( def ) ;